Bailey is a remarkably horrible boy who is inflicted on his quite nice cousins for the summer. When he steals Anna's paintbox and paints on the wall of his room, he discovers that he can magically make portals to other times and places.
This was an okay quick read, but nothing special. It could have used more depth: why is Bailey so nasty? where does the magic come from? Predictably, the kids are all great friends by the end of the visit.